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So I have an application that I'd like to change the icon for. If I drag and drop the new icon into the app's Contents/Resources/ via the GUI, the app updates ok.

However, if I cp the icon in the terminal the icon doesn't update, and the original icon is still displayed or a slightly broken version of the original is shown.

What else do I need to do to allow the .icns to be updated via the terminal (I need to be able to script this for a project.)

Many thanks.

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I'd check two things:

  1. Make sure that filename.icns is the exact filename referenced in Contents/_CodeSignature/CodeResources and Contents/PkgInfo

  2. Make sure that the permissions for filename.icns are correct. If you run ls -l from within Contents/Resources/, you should see that filename.icns has the owner root and the group wheel, with permissions listed as -rw-r--r--. If you do not see that, the commands you'll need to run to fix this are:

    sudo chown root:wheel filename.icns

    sudo chmod 644 filename.icns

If you'd like a little more info on permissions check out the following links:

http://www.macinstruct.com/node/415 (helpful guide on permissions and ownership)

https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man8/chown.8.html (chown manual)

https://developer.apple.com/library/mac/#documentation/Darwin/Reference/Manpages/man1/chmod.1.html (chmod manual)

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Unfortunately that's already the case with the permissions / access modes correct, when the file is copied via the shell. BTW, user ownership permissions don't come into play with the drag-drop method. The owner was listed as username:admin – Slomojo Jul 12 '13 at 0:10

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